Improvement in rock-drilling machines



J. S. FRENCH. ROCK DRILLING MACHINE.

No. 40,097. Patented Sept. 29, 1863.'

UNITED STATE-s PATENT OFFICE.- ,c

JOHN S.VFRENO,H, OF SAN FRANCIS-OO, CALIFORNIA.

' IMPROVEMENT iN ROCK-DRILLING MACHINES.

To all whom it may concern:

Beit known that I, JOHN S. FRENCH, of San Francisco, in the county of'San Francisco and State of California, have invented a new and ImprovedRoch-Drilling Machine; and I do hereby declare that the following isaffull, clear, and exact description of the same, ret'- erence being hadt the accompanying drawings, making a part of this specication, inwhichy Figure l is a side sectional view ot' my invention taken inVtheline .fr x, Fig. 3; Fig. 2, a. Vertical section ofl the same taken inthe line y y, Fig. l 5 Fig. 3, a plan or top view of the same; Fig. 4,an enlarged detachedfront View of the mechanism which rotates the drill;Fig. 5, an enlarged detached longitudinal view of the mechanism whichconnects the drill with the draw-back slide.

This invention relates to a new and improved rock-drilling machinefortunneling and-other purposes; and it consists in constructing andarranging the parts in such amanner that the drill may be turned andadjusted in either a vertical or a horizontal plane, so that holes' maybe bored in any desired direction-that is to say, either vertically,horizontally, or at any degree of inclination between said posi- 'tionsand at any point in a circle, the plane of which coincides or isparallel with the axis of the drill. c

The invention further consists in a novel arrangement vof means foroperating the drill, whereby the same is drawn back from the hole aftereach stroke and turned while being drawn back, thus imitating orcorresponding with the ordinary hand-manipulation of rockdrills, theblow being given the drill by'means of a hammer koperated by a cam andsprings, as hereinafter fully set forth. The machine is placed ortit-ted upon a truck to enable the drill to be readily placed linlposition or adjusted to its work.

To enable those Skilled in the art to fully derstand and construct myinvention, I will proceed to describe it.

A represents a'truck, which may be constructed of wood, provided withtwo small wheels, a a, at one end, and two handles, lfb, at itsopposite, the whole being arranged in the same way as an ordinaryhandtruck; On this truck there is permanently secured an annularplate,B, of nietal, on which a metal column, O, rests, said column having aplate, D, attached to its lower end, which is slotted longitudinally, asshown at c, and through whichl slot and the truck A a screwb'olt, E,

passes, said screw-boltbeing provided with ablock, F, of metal, throughwh-icha vertical screw, G, passes, said screw1 being rotated' whennecessary by vmeans of bevelgears e at its upper end in order to.raiseand lower the block F, which is allowed to slide freely in C.

H-represents arms, which are secured to a horizontal pin, g, the latterpassing through a.- vertical slot, h, in'the column land info the blockF, as shown clearly in Fig.'2. To this block F there is also attached ahorizontalarm, i, which passes through a vertical slot,l j, in the sideof the column C opposite to the side in whichI the slot h is made, andon this arm the frame I of the drilling-machine is hung and allowed toturn freely. To the frame l there is secured Aa circle plate, J, whichis concentric with the arm ,'on which the frame I is hung. 'This circleplate J is VprovidedA with a flange, which extends all around itsperiphery, andhas a lip, k, at one end of a bolt, Z, passin over it,lsaid bolt passing through the outer part of one of the arms H, andhaving a thumb-nut, m, upon it. By this arrangement it will be seen thatthe frame I may be yturned on the arm i and securedA at any point of anentire revolution thereon by screwing up the thumb-nut m, so that thelip k will clamp the flange j ofthe circle plate J. The frame I israised and lowered by turning the screw Gr. In the'fupper part ot' theframe I there isplaced transversely a shaft, K, having a cam, L upon itand a-crank, n. The cam L is sim` `ply a. curved arm, as show-n clearlyin Fig. 1.,

and it works against a roller, o, at one end ofl -an oblong slot, p, ina bar, M, which is ar vranged-so as to slide in the upper part of theframe I. Thisl bar M passes through the up` per partof aswinging pendentarm, N, the upper end of which is attached to a rock-shaft, 0, -in .theupper part of the framing I, and the bar M has a stop, q, upon it, whichcatches against the arm N and draws it back in the direction indicatedby arrow 1, when the cam L draws ba'ck the bar M. This stop q may beadjusted -at different points on the bar M in order to regulate theextentof the swing of the arm N, as may be desired. The bar M each timeit is relieved from the act-ion of cam L has a forward motion given itby means of springs yl?, which may be of spiral or other form. To thelower end of the arm N a hammer, Q, is attached. y

In the lower part ot` the frame I there is litted a slide, R, which hasarack,1,on its upper surface, into which a pinion, s, gears, said pinionhaving a ratchet, t, attached to one side of it. Into the ratchet t apawl, S, catches, which is-operated from the crankn of shaft K.

To the slide R there are attached two spiral springs, u u, one at eachside, and these springs are connected by cords o o to a shaft, u', whichpasses transversely through the lower partot' the frame I, and has aratchet, a', at one end, into which a holding-pawl, b', catches. -(SeeFig. 3.)

At the front end of the slide R there is an upright ledge, c', which hasa semicircular recess made in its upper end to receive the lower part ofa circular collar, d', on the drill T, the collar being allowed to turnfreely in the recess inthe ledge c. The drill is of polygonal form, andit rests in a box, V` the interior of which where -the drill rests beingalso of polygonal form. T he exterior of box V is of cylin dricalt'orni, and is fitted in bearings e', so that it may rotate freely. Thebox is constructed of twolongitudinal parts of equal size, and each ofsaid parts has a half-bevel pinion,j7, upon it, which form when -incontact, and the two parts of the box are adjusted together,a wholepinion, into which a bevel-pinion, g', gears, the pinion g having aratchet, h', attached to it, into which a pawl, V, catches, vwhich isattached to the pawl S at i. (See Fig. l.)

The two parts of the' box Vare held together in close contact by aclamp, W, which may be arranged in any properway.

The operation of the drill is as follows: The Ashaft K may be rotatedthrough the medium .of` any convenient power, and a swinging motion isgiven the hammer Q through the mel diuin of the cam L, sliding bar M,and springs P,'as previously referred to. Each timethe hammer Q is drawnback the slide Ris made to move back also, in consequence of the crankn, pawl S, ratchet t, pinion s, and rack r, and as the slide R is drawnback the drill T is drawn back with it, in consequence of the collar don the drill heilig fitted in the ledge c' on slide R. As the slide Rmoves back the drill T is rotated through the medium of the gearing j7g', the ratchet h', and pawl V. The pawl V receives its motion from thepawl S. When thepawl S loses its hold ofthe ratchet h', the springs u uforce' the drill T forward, and each time the cam L passes the roller ol`be understood by the description previously' given of the adjustment ofthe frame I, may

be adjusted in a horizontal, vertical, or inclined position, accordingto the direction in which it may be required to work and at any timewhena new or sharp drill requires to be inserted. The dnl-l one isremoved by releasing the clamp W from the box V and detaching one partof the latter, the. sharp drill being fitted in the box V after the dullone 1s removed, and the clamp W adjusted again in proper position. Thisis but' the work of a moment.. The whole device may be readily movedfrom place to place, so that the machine lmay be adjusted in any desiredposition.

I would remark that the tension of the springs u u'may lbe regulated asdesired by turning or adjusting the shaft w. 4

Having thus described my invention, what I claim as new, and desire tosecure by Let` ters Patent, is

1. .The manner of arranging the frame-I of the machine so that it, andconsequently the drill T, may be adjusted in either avertical orhorizontal position or at any degree of inclina` tion between thosepositions and 'at any point in a circular plane' parallel with the axisof the drillto wit, by having the frame I hung. loosely on an arm, i,which-'vis attached to a block or nut, F, fitted in a vertical column,C, having avscrew, G, placed in it,l which passes'through the block ornut and the column arranged to turn on a'plate, B, 'on the truck A, thec'olulnn being retained at any Vdesired point, and also the frame I, bythe means herein described, or their equivalents.

2.r The drawing back., of 'the drill T after each stroke by means of theslide R, connected with the drill through the medium of the collar d',fitting in the ledge'c on the slide,- the slide being operated by therack r', pinion s, pawl S, and crank n on shaft K, and springs u u, ortheir equivalents, as set forth.

3. Rotating or turning the drill T during its backward movement by meansof the box V, gearing f Q',ratchet h', and pawl V, attachld to the pawlS, substantially as set fort .4. Operating the hammer Q through themedium ofthe cam L, slide-bar M, and springs l? P, substantially asspecified.

Witnessesz JOHN S. FRENCH.

Trios. S. J. DOUGLAS, A. R. HAIGHT.

